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1; Ensure we don't run analyses over loops after they've been deleted. We run2; one version with a no-op loop pass to make sure that the loop doesn't get3; simplified away.4;5; RUN: opt < %s -passes='require<iv-users>,no-op-loop,require<iv-users>' -S \6; RUN: | FileCheck %s --check-prefixes=CHECK,BEFORE7; RUN: opt < %s -passes='require<iv-users>,loop-deletion,require<iv-users>' -S \8; RUN: | FileCheck %s --check-prefixes=CHECK,AFTER9 10 11define void @foo(i64 %n, i64 %m) nounwind {12; CHECK-LABEL: @foo(13 14entry:15 br label %bb16; CHECK: entry:17; BEFORE-NEXT: br label %bb18; AFTER-NEXT: br label %return19 20bb:21 %x.0 = phi i64 [ 0, %entry ], [ %t0, %bb2 ]22 %t0 = add i64 %x.0, 123 %t1 = icmp slt i64 %x.0, %n24 br i1 %t1, label %bb2, label %return25; BEFORE: bb:26; BEFORE: br i1 {{.*}}, label %bb2, label %return27; AFTER-NOT: bb:28; AFTER-NOT: br29 30bb2:31 %t2 = icmp slt i64 %x.0, %m32 br i1 %t1, label %bb, label %return33; BEFORE: bb2:34; BEFORE: br i1 {{.*}}, label %bb, label %return35; AFTER-NOT: bb2:36; AFTER-NOT: br37 38return:39 ret void40; CHECK: return:41; CHECK-NEXT: ret void42}43